How many rolls of wallpaper do I need per wall?

Divide the wall length by the roll width for strips, work out how many whole strips a roll yields at your wall height plus repeat rounding, and divide. A typical 4 m wall at 2.5 m height in standard 53 cm rolls needs 8 strips — 3 rolls of plain paper.

What does pattern repeat mean on a wallpaper label?

The vertical distance before the design repeats. Each strip must be cut at a multiple of it so motifs align across strips, which turns a 2.6 m wall height into a 3.18 m cut on a 53 cm repeat — the difference is waste.

Should I subtract windows and doors from the measurement?

Usually not. The pieces cut around openings are rarely reusable elsewhere, and keeping them in the count provides the safety margin every decorator wants. Subtract only for openings that dominate the wall.

Why should all rolls come from the same batch?

Colour shifts slightly between print runs. Rolls from different batch numbers can differ visibly once side by side on a wall, so buy together, check batch numbers on delivery, and keep a spare roll for repairs.

How much extra should I buy beyond the calculation?

One spare roll is the standard cushion — it covers a miscut, a damaged strip during hanging, and future repairs from the same batch. Complex rooms with many corners justify two.

Wallpaper Calculator

Work out how many wallpaper rolls to buy from wall size, roll size and pattern repeat — counted in whole strips, the way decorators do.

The Wallpaper Calculator runs entirely in your browser. Room measurements are processed on your device and never uploaded.

Open the Paint Calculator

About Wallpaper Calculator

Wallpaper Calculator counts the way a decorator counts, not the way an area formula does. Paper goes up in vertical strips: each strip must be cut to the wall height plus trim, rounded up to a whole pattern repeat so the motif lines up with the strip beside it. A roll then yields a whole number of strips — a 10 m roll gives three 2.77 m strips, and the leftover metre is unusable offcut. Divide your total wall length by the roll width for the strips you need, and the rolls follow. This is why area-based estimates run short on patterned paper: a 53 cm repeat can waste half a metre per strip, and only strip-based counting sees it. Enter your walls in metres or feet, pick a standard roll size, and get rolls, waste and an optional cost.

Features

Strip-based counting with whole strips per roll, not raw area
Pattern repeat rounding so motifs match across strips
Standard European and US roll presets plus custom sizes
Trim allowance per strip included
Waste per strip shown, so patterned paper surprises are visible
Metric and US units
Optional cost estimate from price per roll
Everything computed on your device

How to use the Wallpaper Calculator

Measure the total length of wall to paper and the wall height
Enter the pattern repeat from the label — 0 for plain paper
Pick the roll size printed on the label
Read rolls to buy, strips per roll and waste per strip

Example

Input

12 m of wall · 2.5 m high · 53 cm repeat · 0.53×10.05 m rolls

Output

23 strips · 3 per roll · 8 rolls

Plain paper needs 7 rolls for the same wall — the repeat costs one roll.

Common errors & troubleshooting

The result asks for more rolls than an area calculation suggests. — Area formulas ignore strip cutting. A roll only yields whole strips, and pattern repeats round each strip up — both losses are real and both are why decorators buy by strips.
Doors and windows were not subtracted. — Standard practice is to ignore normal-sized openings — the offcuts around them are rarely reusable and the margin covers mistakes. Only subtract for very large openings like patio doors.
Two batches of the same paper look slightly different on the wall. — Dye lots vary between print runs. Buy every roll from the same batch number, and buy one spare — a later repair with a different batch will show.
A drop-match pattern needs more paper than the calculator shows. — Enter the effective repeat for offset matches — for a half-drop pattern that is the repeat plus half a repeat. The label usually states it as, say, “64/32 cm offset”.

Frequently asked questions

How many rolls of wallpaper do I need per wall?: Divide the wall length by the roll width for strips, work out how many whole strips a roll yields at your wall height plus repeat rounding, and divide. A typical 4 m wall at 2.5 m height in standard 53 cm rolls needs 8 strips — 3 rolls of plain paper.
What does pattern repeat mean on a wallpaper label?: The vertical distance before the design repeats. Each strip must be cut at a multiple of it so motifs align across strips, which turns a 2.6 m wall height into a 3.18 m cut on a 53 cm repeat — the difference is waste.
Should I subtract windows and doors from the measurement?: Usually not. The pieces cut around openings are rarely reusable elsewhere, and keeping them in the count provides the safety margin every decorator wants. Subtract only for openings that dominate the wall.
Why should all rolls come from the same batch?: Colour shifts slightly between print runs. Rolls from different batch numbers can differ visibly once side by side on a wall, so buy together, check batch numbers on delivery, and keep a spare roll for repairs.
How much extra should I buy beyond the calculation?: One spare roll is the standard cushion — it covers a miscut, a damaged strip during hanging, and future repairs from the same batch. Complex rooms with many corners justify two.

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